Metallic rod-packing.



O. R. CRUMP & L. J. DAVIS.

METALLIC ROD PACKING.

APPLICATION IILED JUNE 14, 1913.

1 ,089, 1 1 4;, Patented M21113, 1914.

TIN @TATES PATENT CHARLES RAY ORUMP AND LUTHER J. DAVIS, OF CHICAGOJUNCTION, (EH10.

METALLIC ROD-PACKINGn Specification of Letters Patent.

Patented llliar. 3, iltlitct.

To all whom it may concern Be it known that we, CHARLES RAY CnUMr andlnrrnnn J. Davis, citizens or the United States, residing at ChicagoJunction, in the county of Huron and State of Ohio, have inventedcertain new and useful lmprovements in liietallic Rod-Packing, of whichthe following is a specification.

This invention relates to sectional, wear compensating metallic packingfor piston rods and has for it objects to provide a packing composed oftwo sectional rings arranged side by side on a piston rod with thejoints of the sections so arranged as to prevent all torwa rd passage ofsteam, either between the rings and rod or between the var ous parts ofthe rings or between the l11C1- vidual rings.

A further object is to provide means to insure a perfectly tight fit atall points, so that the wear on one ring of the packing might be morethan on another and still both rings would remain equally t1ght;likewise, it the wear on one section or segment i more than on anotheror either or both rings, so that the ring so aiiectcd will still beperfectly tight at all points. This unequal wear of parts is oftencaused by some flaw or defective material.

Still another object is to provide means for increasing the influence ofthe spring by cam action, thus facilitating the contracting wearcompensating action of the packing.

A further and secondary object is to provide aflexible metallic packingwhich will permit the piston rod to be raised or lowered or otherwisemoved to center the same without in any manner impairing the elliciencyof the packing or requiring its reassembling and adjustment on the rod,all of which obects, among others, are accomplished by the construction,combination and arrangement of parts hereinafter more particularlydescribed and claimed and illustrated in the accompanying drawingsforming part of this application and in which:

Figure 1 represents aside elevation of a packing embodying ourinvention, the same being applied to av hollow piston rod of an aircompressor; Fig. 2, a top plan view of the same in position in a gland(Z in the packing casing D, another gland (Z being shown for thereception of another packing, if desired. 3, a cross-section on line 3-3of Fig. 1; 4;, a cross-section on line 4 l; of Fig. 1; and Fig. 5, anenlarged detail view showing the cam action oi the periphoral segments 3of the inner ring or the packing on the inner segments l thereof.

it would be well to note that the number of these two ring packings tobe used is to be determined largely by the uses to which the apparatusis to be put. Also the kind of metal employed should be varied to meetthe needs of the particular case, for the temperature on the steam endof the piston rod would vary greatly from that of the compressor end inan air compressor.

Referring now in detail to the drawings, A indicates the piston rod, Bthe outer ring, C the inner ring, of the packing and D the packingcasing having packing receiving glands (Z. The outer ring 13 is composedof three smooth faced segments 1 arranged a slight distance apart andequidistant around the rod. These segments 1 are held in their relativepositions and forced inward to compensate for wear by the circular coilspring 2, which lies in a groove in their outer edges. The inner ring Cconsists of a peripheral set of three segments 3 and an inner set ofthree segments el, arranged break-joint fashion. The inner set ofsegments 4 is arranged concentrically on the rod and each segment islocated equidistant therearound and opposite the openings in the ring Band is provided on its outerside with a pin 5 which projects between thetwo adjacent segments 1, thus holding the rings B and G in properposition with relation to each other. The outer set of segments 3 ofring C is arranged around the inner set of segments 4 in break-jointfashion with relation thereto and each segment 3 is provided on itsinner face with a spacing pin 6, which projects inwardly into the spacebetween the two adjacent inner segments 4:, thus keeping the inner andouter sets of segments of ring C in proper relation with regard to eachother. also, the inner faces of segments 3 are ground on a curveeccentric to the rod, so that these segments 8 will engage the segmentst on their tip ends only, thus exerting a cam or lever action on thesegments 4; and forcing them down on said piston rod with absoluteperfection of fit. This one point engagement forces the segments 4inwardly and together to coin pensate for wear and it also greatlyfacilitates such movement as is obvious, greatly decreasing allfriction. A circular coil spring 7 lying in a groove in the outer edgesof the segments 3 holds all the segments 0 and at of ring (J in placeand acts to force segments 3 inward, with the above described result. Itis to be noted that each ring of the packing has its own independentspring.

In practice all faces of the segments should be machined to insure aperfectly tight fit. The end pressure on the outer ring B forces ittightly against ring C, thus preventing all leakage of the steam or air,or other fluid, between the rings, and the cam action of segments 3 onsegments t forces the latter tightly against the rod, preventing allleakage of steam or air, or other fluid, between the segments at and therod, thus the packing is absolutely tight.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patentis:

l. In a metallic rod packing, an outer sectional ring and means forholding the sections in position, in combination with an inner ringcomposed of a peripheral set of segments and an inner set of segments,the inner set having their inner faces ground concentrically to the rodand the outer set having their inner faces ground eccentrically to therod, thus touching the inner segments only on their tip ends, and aspring passing around the outer segments, the outer ring of the packingbeing presented toward the pressure end of the rod.

2. In a metallic rod packing, an outer sectional ring and means forholding the sections in position, in combination with an inner ringcomposed of a peripheral set of segments and an inner set of segments,the inner set having their inner faces ground concentrically to the rodand the outer set having their inner faces ground eccentrically to therod, thus touching the inner segments only on their tip ends, spacingpins secured in said segments to hold them in proper relation to eachother and the two rings in proper relation to each other, and a springpassing around the outer segments, the outer ring being presented towardthe pressure end of the rod.

3. In a metallic rod packing, an outer ring composed of segments and aspring passing around their outer edges, in combination with an innerring composed of a peripheral set of segments and an inner set or"segments, the inner set having their inner faces ground concentricallyto the rod and the peripheral set having their inner faces groundeccentrically to the rod, thus touching the inner segments only on theirtip ends, and a spring passing around the outer se ments, the outer ringbeing presented toward the pressure end of the rod.

In testimony whereof, we have signed our names to this specification inthe presence of two subscribing witnesses.

CHARLES RAY CRUMP. LUTHER J. DAVIS.

Vitnesses:

C. E. FETZER, HARVEY A. FETZER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

